Process of producing a cold glue from blood



of Germany,

Patented ept. 1%, i923.

STAR

rarra tux, or MANNHEIM,

raocnss or rnonocme a com) GLUE raom enooii.

Ho Drawing. Application, filed. July 3,

: (GRANTED UNDER THE PROVISIONS OF THE .llCT OF MARCH 3, 1921, 41 STAT. L, 1313.) I

T i) all whom it concern.

Be it known that 1, Farm Lox, a subyect residing at Mannheim, Germany, have invented certain new and useful Improvements in Processes of Producing a W Cold Glue from Blood (for which I have filed applications in Italy, April 22, 1919; France, May 22nd, 1919, and obtained the following patents: Spain, 69763, July 2, 1919; Argentina, 16,599, October 30, 1920; Germany, 307,687, J uly 1st, 1918), of which the following is a specification.

it is known to employ blood albumen for gluing of wood. To this end the blood is whipped and stirred and then evaporated. The blood albumenobtained in this way is stirred up with waterand used as glue. Under this process, however, the fibrin which possesses great adhesive properties is separated out.

According to the present process the blood as it is obtained from animals is converted with lime binding substances such as oxalic acid, sodium citrate or the like and the fibrin which would otherwise separate tion always takes place for out remains in solution. This blood is then evaporated for example in a vacuum at a temperature which does not produce coagulation. The dry residue then obtained can be again dissolved in water especially when the latter is rendered alkaline. This solu tion which in a small quantity of water is very viscous can be used without further addition for gluing wood for example, and forms-a glue having great adhesiveness. wood thus glued is then heated to a temperature above 70 C. both the albumen and the fibrin coagulate and the coating ot glue then becomes insoluble in water. Coagulaexample in gluing crossed wooden plates as these are hot pressed. If to the solution obtained from the blood treated with oxalic acid etc. and evaporated is added a soluble calcium salt coagulation otthe fibrin takes place. The time within which coagulation occurs is dependeniron the solubility of the calcium salt. In order that coagulation shall not take place too quickly or in other words that the glue shall remain usable for a longer t me GERMANY, ASSIGNOR TO THE FIRM LUFTFAHRZEUGBAU SCHllTTE-LANZ, OF MANEJHEIEI- 1920, Serial No. 394,011. Renewed may 14:, 1923.

calcium salts or their compounds diiiicultly ,lutrons' coagulation of the fibrin also takes v blood with wounds.

attests orac e,

EINAU, summer.

or. slowly soluble as for example calcium chloride fructose and the like are employed. ln gluing with fibrin-containing blood so place due to the calcium salts contained in the wood.

The particularly good of this glue consists in this that the comparatively brittle albumen is impregnated with tough fibrin just as occurs in clotted adhesive properties What I claim is 1. In a process of producing a cold glue from blood, the step of treating the freshly taken blood to be dried with a calcium binding substance so as to prevent the fibrin from separating out.

.2. ln a process of producing a cold glue from blood, the step of treating the freshly taken blood to be dried with oxalic acid so as to revent the fibrin from separating out.

3. process of producing a cold glue from blood. consisting in treating; the freshly taken blood with a calcium binding substance and treating further the blood al bumen so obtained, which contains the fibrin, with a soluble calcium salt so as to produce after gluing a glue insoluble in water.

4. A process of producing a cold glue from blood, consistin freshly taken blood with a calcium binding substance, evaporating this blood at a temperature which does not produce coagulation and treatin;, the solution so obtained \yitlre. soluble calcium salt,

5. A process of producing a from blood, consisting in treating freshly taken blood with oxalic acid, evaporating the so prepared blood in a vacuum at atemperature which does not produce a FRITZ Lox.

Witnesses:

Hermon HEMPEL,

Max VOGEL,

cold glue the in treating the 

